Ain’t It Cool News is reporting that there are rumblings of a possible sequel to the 2007 adaptation of the classic, post-apocalyptic 1954 Richard Matheson novel starring Will Smith. Though there is no official confirmation, AICN is indicating that a source has told them that the previously-rumored prequel to the movie, which depicts Smith as the last man alive on Earth, fighting and surviving against hordes of mutated, vampire-like creatures created by a plague, and searching for other signs of humanity. The movie updates the book’s story by making Smith a military scientist who is actually indirectly responsible for the plague. AICN’s source writes; “Let’s start at the beginning. Smith…